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Apr 30, 2024

Dynatron L32 SP5 1U Liquid Cooling for AMD EPYC Genoa and Bergamo

The Dynatron L32 is an AMD socket SP5 cooler designed for the AMD EPYC 9004 “Genoa” and upcoming Bergamo CPUs. While there are many coolers on the market, one of the exciting parts of this cooler is

The Dynatron L32 is an AMD socket SP5 cooler designed for the AMD EPYC 9004 “Genoa” and upcoming Bergamo CPUs. While there are many coolers on the market, one of the exciting parts of this cooler is that it is a 1U cooler with an important twist. It is a 1U all-in-one (AIO) liquid cooler. We have been using this for an upcoming piece and decided to show it off to the STH community that may not know such a solution exists.

The cooling block is very interesting. If you saw our feature on the Dynatron L31 for the Intel LGA4677 socket, there were different metals used for the mounting bracket and the cold plate. Here, it is just a copper base with a plastic top.

The nozzles are pre-fitted with tubes, and they are inboard the socket to make clearance around the socket less challenging.

The cold plate has pre-applied thermal paste that is in an absolutely massive array. The liquid cooler has tubes fitted and is pre-filled with coolant as part of the AIO design making installation relatively easy.

Here is the AIO cooler includes a radiator. This radiator has three 40mm fans installed along with a pump for the assembly. That also means a server using this solution will need to power three 4-pin PWM fans plus a pump. Many small motherboards do not have many fan headers, so this can be challenging.

The other side of the radiator has alternative mounting points for three 40mmm fans. Most applications will use the default setup since that is common when we see systems that use 1U liquid coolers like these.

In terms of key specs, you can find them for this cooler here:

Something we will notice here is that at a lower duty cycle, the Dynatron L32 is 42.26dBA while the L31 was under 20dBA.

This is very similar to the Intel LGA4677 Dynatron L31, so we thought it may be worth looking at the L32 versus the L31 below.

Here is a look at the AMD SP5 socket cooling block for AMD EPYC 9004 series in the Dynatron L32 next to the Dynatron L31 that we have been showing here. This gives some sense of just how much bigger the AMD socket is.

Since these are AIO coolers it is a bit challenging to show them side-by-side. Still, here is a look at the Dynatron L31 for Intel and the L32 for AMD radiators side-by-side.

They are slightly different but very similar designs, and both are designed to cool 350W CPUs.

The Dynatron L32 is a really interesting design. Our testing thus far has confirmed that it is far from a quiet solution. At the same time, it provides an enormous benefit for those looking to design 1U AMD EPYC Genoa solutions. Price-wise, these generally retail in the $119-130 range, making them about the same price as a quality 4U+ cooler for these platforms. For larger servers, these perhaps do not make sense, but they have been an interesting addition to the lab.

While this is an all-in-one if you want to see how higher-end liquid cooling in servers works, check out our How Liquid Cooling Servers Works with Gigabyte and CoolIT.

We also were able to check out the CoolIT liquid cooling lab tour that folks interested in liquid cooling may find fun.